Mister Chalk really is unnerving. On one hand, he made it obvious that Sandra should be wary of him ("I'm not your friend"). He says outright that he may be more dangerous than Incubus, and that he may escape along with Sandra. The last update is nothing but brutal honestly from his part.On the other hand, one thing is certain: he doesn't want Sandra to die. He is actively trying to get her out of here. Maybe because his destiny is intimately tied to her, maybe if she dies, he dies (well, is he trapped inside of her? Is he a parasite, the "real" Zebra demon? Is he a part of her psyche? Is he Satan himself? It's impossible to know at this point). He's also concerned by Mabel well-being (which I find very odd: is it true benevolence, or is he pursuing an alternate goal here?).Truly a mistery. And a good one, at that.
Or maybe it's all just manipulation on his part? 'Admitting' that he may be worse doesn't actually tell Sandra anything more than she already knew and suspected, he merely voiced what she was already suspecting (note he said MAY BE worse, he doesn't come out and say it, just as Sandra isn't certain that he is), admitting that you may be a threat ironically often makes people trust you more since they think "Well, at least he tells it how it is" when you actually have not told them anything. The other parts all seem geared at actually confusing the matter, make Sandra think of other things. Misdirection in short, there is nothing honest about what he has said, he has merely given voice to what Sandra was already thinking. Then again, maybe he's just an aspect of her own mind echoing back her own thoughts?